Adapterops dimbyi Trýzna & Baňař, 2017

Trýzna, Miloš & Baňař, Petr, 2017, Two new species of Adapterops (Coleoptera: Anthribidae) from protected areas of northern Madagascar, with a key to species, and new faunistic data on the genus, Zootaxa 4231 (2), pp. 238-250 : 243-248

Adapterops dimbyi Trýzna & Baňař sp. nov.

( Figs. 2, 4 , 12–18 , 23 )

Type locality. North Madagascar, Antsiranana province, Ankarana National Park , S 12°58´07.3´´, E 49°08´12.9´´, 132 m.

Type material. Holotype (male): N MADAGASCAR, ANTSIRANANA PROVINCE: ‘N MADAGASCAR, 24.i.2016, / Ankarana National Park , 132 m / S 12°58´07.3´´, E 49°08´12.9´´ / Benavony circuit, M. Trýzna leg.’ ( BSNPC) . Red label [p] HOLOTYPE / Adapterops / dimbyi sp. nov. / M. Trýzna & P. Baňař det. 2016.

Description. Male holotype. Measurements (in mm): Total body length—2.10. Head: total length—0.32; length of rostrum—0.14; maximum width of rostrum—0.29; length of eye—0.18; maximum width across eyes— 0.49; minimum distance between eyes—0.16. Antenna: length of segments: II—0.08, III—0.07, IV—0.06, V— 0.0 5, VI—0.06, VII—0.06, VIII—0.04, IX—0.11, X—0.09, XI—0.14. Pronotum: maximum length—0.51; width at carina—0.78; minimum width—0.27. Elytra: maximum length—1.22; maximum width—0.81.

Colouration of all body parts generally dark brown; scape, pedicel and antennomeres III–V brown, VI–VIII dark brown to blackish; antennal club entire black, only tip of antennomere XI dark brown. Legs dark brown, distal part of tibiae and tarsomeres

gloomy. Pronotum with spots, elytra with spots and stripes of whitish pubescence. Entire ventral part of body dark brown.

Vestiture. Head with sparse appressed setae, whitish between eyes, yellowish on dorsal part of rostrum. Antennae with pubescence, scape, pedicel and funicle covered with sparse blackish suberect setae, antennal club with black appressed setae. Pronotum with whitish setae forming regular spots: two distinct on disc, two distinct longitudinal spots on lateral part of pronotum. Anterior part of pronotum with transverse stripe interrupted in the middle, posterior part of pronotum covered by sparse undistinguished setae. Elytra also covered with whitish setae. Each elytron with one distinct spot in humeral part, one triangular spot in subbasal part from the second to the fourth elytral interval, next spot from the fifth to sixth elytral interval. Two conspicuous transverse stripes in central and preapical part of elytra, these narrow stripes are interrupted in sutural part and reached to lateral edges of elytra. Apical margin of elytra with whitish edge. Legs including tarsomeres covered with dense, fine yellowish decumbent setae. Venter of thorax and abdominal sternites with dense yellowish pubescence. Pygidium covered with sparse yellow appressed setae.

Structure. Head. Rostrum very weakly convex, anterior part with gentle sculpture. Dorsum of head without longitudinal carina in the middle. Eyes large, not emarginate, ocular index 0.97. Ratio of maximum width across eyes to the maximum width of rostrum 1.67. Antennae slightly longer than head and pronotum together. Funicle thin, club moderately robust. Pronotum transverse (ratio of its length to its width at carina 0.65), gradually narrowed anteriorly, disc convex in middle. Dorsal transverse carina slightly curved. Postero-lateral edges of pronotum obtuse-angular. Posterior margin conspicuously convex, fitting in concavity on base of elytra. Elytra elongated oval, slightly narrowed posteriorly. Ratio of maximum length of elytra to maximum width 1.51. Anterior margin of elytra concave, corresponding with the convexity of posterior margin of pronotum. Surface of elytra deeply striate, width of each stria distinctly narrower than width of elytral interval. Abdominal ventrites I–V flattened in the middle.

Male terminalia ( Figs. 12–17 ). As generally described above, anterior margin of tergite VIII straight, apodeme of sternite VIII of the same length as segment VIII, tegminal process broken off in studied specimen, but basalmost part of the process remaining on the tegminal plate, branches of basal piece convergent ( Fig. 15 ), apex of pedon basally with conspicuous constriction ( Fig. 13 ).

Female. Unknown.

Differential diagnosis. Generally, the new species is similar to Adapterops cedrici Trýzna & Baňař 2015 and A. mamyi Trýzna & Baňař sp. nov. It can be distinguished from A. cedrici by two transverse stripes on elytra in median and preapical parts and the light coloured tip of antennomere XI; from A. mamyi by black antennal club (with exception of mentioned light coloured tip of club), blackish antennomeres VI–VIII and two transverse distinct stripes in central and preapical parts of elytra. Comparatively narrower species. From A. mamyi it differs by converging branches of basal piece ( Fig. 15 ) (diverging in A. mamyi ); straight anterior marging of tergite VIII ( Fig. 17 ) (convex in A. mamyi ); finer and sparser sclerotized teeth on internal sac of aedeagus (denser and more robust in A. mamyi ) and basally constricted apex of pedon ( Fig. 13 ) (regularly narrowing in A. mamyi ).

Etymology. Patronym, dedicated to Dr. Dimby Raharinjanahary from Madagascar National Parks (Chargé des Bases de données de suivi biodiversité et recherche).

Habitat. Species was collected in Ankarana National Park, Benavony circuit, in western dry forest at an altitude of 132 m. A single male specimen was collected by sweeping of the main trunk of a deciduous tree. A local guide who was present identified this trunk as an ebony tree ( Ebenaceae , Diospyros sp.). The standing trunk was old, covered with only discontinuous, disrupted and peeling bark. The largest diameter of this trunk at its base was ca 15–18 cm and height ca 7 m. The new species was collected together with other anthribid species, namely species of Mecotarsus , Dysnos and several further species of the subfamily Choraginae . Microhabitat of this species is shown in Fig. 18 .

Distribution. North Madagascar, Ankarana National Park ( Fig. 23 ).

Figures

FIGURE 18. Dead trunk of a deciduous tree in Ankarana National Park, microhabitat of Adapterops dimbyi sp. nov.

FIGURE 23. Distribution of Adapterops species in Madagascar.

FIGURES 1 – 4. 1, 3, Adapterops mamyi sp. nov., male holotype; 2, 4, Adapterops dimbyi sp. nov., male holotype; 1 – 2, dorsal habitus; 3 – 4, lateral habitus. Scale bars in mm.

FIGURES 12 – 17. Adapterops dimbyi sp. nov., male holotype; 12, aedeagus, lateral view; 13, aedeagus, ventral view (arrow indicates strangled apex of pedon); 14, tegmen, lateral view; 15, tegmen, ventral view (arrow indicates tegminal process, broken off); 16, pygidium, dorsal view; 17, segment VIII and sternite IX, ventral view. Scale bars in mm.